Rugged, extra heavy-duty .125 tread plate construction for durability and long-term use. Model 437000 and 438000 have two full center baffles for strength, model 439000 has single full baffle. 2 in NPT reinforced bungs allow reversing the lockable filler cap for easy access from either side of the tank. Welded tie-down brackets for securing the tank in the truck bed.